import Vue from 'vue'
import Router from 'vue-router'
import Login from './components/Login.vue'
// import Liang from './components/Liang.vue'
import Home from './components/Home.vue'
import Welcome from './components/welcome.vue'
import Users from './components/user/Users.vue'

Vue.use(Router)

const router = new Router({
  routes: [
    { path: '/', redirect: '/login' },
    // { path: '/', redirect: '/liang' },
    // { path: '/liang', component: Liang },
    { path: '/login', component: Login },
    {
      path: '/home',
      component: Home,
      redirect: '/welcome',
      children: [
        { path: '/welcome', component: Welcome },
        { path: '/users', component: Users }
      ]
    }

  ]
})

router.beforeEach((to, from, next) => {
  if (to.path === '/login') return next()
  const tokenStr = window.sessionStorage.getItem('token')
  if (!tokenStr) return next('/login')
  next()
})

// 挂载路由导航守卫
// router.beforeEach((to, from, next) => {
//     // to 将要访问的路径
//     // from 代表从哪个路径跳转而来
//     // next 是一个函数，表示放行
//     //     next()  放行    next('/login')  强制跳转

//     if (to.path === '/login') return next()
//         // 获取token
//     const tokenStr = window.sessionStorage.getItem('token')
//         // 如果没有token(钥匙)，直接返回登录页面
//     if (!tokenStr) return next('/login')
//         // 如果有放行
//     next()
// })

export default router
